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• Existing Septic Tank Usage in the Vicinity To estimate the existing septic system usage in the area, our office counted septic systems located within approximately four square miles surrounding the property. Aerial imagery from Google Earth was used. Each building cluster on the photograph was assumed to have one septic system. Using this method, it is estimated that five or more septic systems per square mile are present in the immediate vicinity of the Site. The general area consists of orchards and open, agricultural land with scattered rural residences along the roadways. Septic Permit History in the Vicinity Based on a review of septic permits on file at the San Joaquin County Environmental Health Department for nearby properties, it appears that most septic systems in the area utilize leach lines with seepage pits. The septic permits can be found in Appendix 4 of this report. Expected On-Site Maximum Septic Tank Usage Maximum expected septic usage on the Site would be from the existing house and mobile home, as well as from a potential future home and second unit dwelling on each of the other two new parcels. No construction is planned. • Ground Water Information Depth and Gradient Live Oak reviewed ground-water elevation information available from the San Joaquin County Flood Control and Water Conservation District to determine the ground-water levels near the Site. Data from the spring and fall of 2016 were the most recent available from this source (Plates 5 and 6). According to an analysis of these maps, the ground-water elevation is approximately 25 to 47 feet below mean sea level; the ground-water flow is to the west or northwest at a rate of approximately eight to 10 feet per mile. Given that the ground elevation of the Site is approximately 87 to 95 feet above sea level, based on the County ground-water maps the depth to ground water below the Site is estimated to range between 112 to 142 feet. Potential Ground Water Contamination Issues The Soil Suitability Study is not intended to be an investigation into ground-water contamination sources, and no such investigation was conducted. Many sources can contribute to ground water contamination, including leaking underground storage tanks, • agricultural activities, dairies and cattle ranches, septic systems, and storm water LOGE 1826 Page 3